How the Squid Lost Its Shell

  • Publicado el 17 abr 2018
  • The ancestors of modern, squishy cephalopods like the octopus and the squid all had shells. In ancient times, their shell was their greatest asset but it eventually proved to be their biggest weakness.
    Special thanks to Franz Anthony for the beautiful cephalopod reconstructions. You can see more of Franz's tremendous work at
    And thanks as always to Nobumichi Tamura for allowing us to use his wonderful paleoart:
    Produced in collaboration with PBS Digital Studios:
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  • Ciencia y tecnologíaCiencia y tecnología

Comentarios • 1 886

  • GameCubular 2001
    GameCubular 2001 Hace 3 horas

    The Mollusk lingers with its wandering eye.

  • hadrian k.
    hadrian k. Hace 3 horas

    Who knew cephalopods' history was so complex?!

  • sexy cabbage
    sexy cabbage Hace 7 horas

    Soon humans will be able to fill there bones with helium and start floating around like a balloon.

  • Sinead Woods
    Sinead Woods Hace 9 horas

    The Devonian period. a.k.a. The fish problem. 😂

  • Nmethyltransferase
    Nmethyltransferase Hace 16 horas

    o/` We're just a bunch of crazy ammonites,
    Living in a mesozoic paradise o/`

  • DoppleQ
    DoppleQ Hace 22 horas

    squishy wizard

  • Cam H
    Cam H Hace un día +1

    5:36 Anybody else see this Zelda type character in the pattern of the squid thingy?

  • Vandy Niyomkham
    Vandy Niyomkham Hace un día +1

    and that's why they taste so good

  • TheSirrchad
    TheSirrchad Hace un día +1

    I love you PBS wish I could give you a kiss loved you for a while now

  • Open Eye
    Open Eye Hace un día

    Could you image the first one to fill its shell with gas? It looks like team rocket is blasting off again!!!

  • sandile msibi
    sandile msibi Hace un día

    Evolution of Sex

  • Agustín Auditore
    Agustín Auditore Hace un día

    Omg hank!!!1

  • McLovin143627
    McLovin143627 Hace un día +1

    How the squid lost it's shell: Natural Selection

  • juna rose
    juna rose Hace un día +1

    luv ur channel

  • Walter Rajashekaran
    Walter Rajashekaran Hace un día

    @ Hank Green What happened to SciShow? Do you not work there anymore?

  • morbid1789
    morbid1789 Hace un día

    haha how do ppl dislike this

  • Agoeha Atineh
    Agoeha Atineh Hace un día


  • Smol Kitten
    Smol Kitten Hace 2 días


  • steven mays
    steven mays Hace 2 días

    There might of been a species of squid that had a shell but not one lots it's shell you guys guess what sounds right to you but trust me part of its DNA that makes its shell did not go away when a new species comes along its two different but the same species making just like the brown bear and the polar bear did

  • Horace Wimp
    Horace Wimp Hace 2 días

    isn't it octopi not octopuses?!

  • Benjamin Schooley
    Benjamin Schooley Hace 2 días +1

    Bringing class to ESclips!

  • cipher88101
    cipher88101 Hace 2 días

    Evolution is amazing, probably took millions of years for a mollusk to fart in his hat and become the first cephalopod.

  • HAL420
    HAL420 Hace 2 días

    The fact that it‘s not nautili but nautiluses makes them very cute.

  • Lars Emil Dalum Larsen
    Lars Emil Dalum Larsen Hace 2 días

    Great episode! Good work. I find it fascinating that even early animal life used blood to transport nutrients etc. around the body. I would really like to see an episode on the evolutionary history of blood.

  • Emil Mortensen
    Emil Mortensen Hace 2 días

    This channel is really amazing. Well made, interesting and with a touch of humor. Along with that, in this video they show baby Cthulhu at christmas time ( plectronoceras). Love it.

  • DanielWhaaaa
    DanielWhaaaa Hace 2 días

    Gonna go eat some calamari

  • NinjaXM0
    NinjaXM0 Hace 2 días

    Damn man I never watched a video here and wasn’t expecting to see hank but damn he’s on every science channel.. big fan

  • machineR90
    machineR90 Hace 3 días

    635-541 million years ago?! Does anyone else see this imaginary number or am I the only one that thinks that these numbers are overexaggerated?

  • The Icean
    The Icean Hace 3 días

    Its the SciShow Guy!

  • Norman1951 Norman
    Norman1951 Norman Hace 3 días

    Very interesting. You could have touched upon the modern giant squid as an apex predator.

  • boxertest
    boxertest Hace 3 días +2

    Very educational and enjoyable :-)

  • ivan bernardo
    ivan bernardo Hace 3 días

    this is very detailed and exact i wonder how people know this

  • Hisnameis IAM
    Hisnameis IAM Hace 3 días

    How did the one that broke off its shell survive long enough top develop that trait?

  • Hisnameis IAM
    Hisnameis IAM Hace 3 días

    I'm still waiting for proof of evolution taking "millions of years" to happen.

  • KP바비 KJ
    KP바비 KJ Hace 4 días

    I eat a lot of squid .....but when i see there face i cant help but think there ao adorible and how it would be nice to have one as a pet

  • Bart De Jaeger
    Bart De Jaeger Hace 4 días

    Do one on the evolution of the different human races and their strategies please

  • laid back attitude
    laid back attitude Hace 5 días +2

    i keep learning more from youtube than i ever did in school....boy times have changed. fantastic video. you my friend have a new subscriber.

  • danikoi
    danikoi Hace 5 días

    Now I feel like eating sushi

  • HarbourOfMarbles
    HarbourOfMarbles Hace 6 días

    Amazing video, thank you!

  • Ramiro Figueiredo
    Ramiro Figueiredo Hace 6 días

    So nice to hear things measured in metric..

  • Xavier Huerta
    Xavier Huerta Hace 6 días

    Hey my house is made of limestone but I found shells like the ones you mentioned in your video

  • CAndiron
    CAndiron Hace 6 días

    And the cuttlefish has a cuttlebone inside. I assume that's the same internal vestigial shell that squid and octopuses have. And now they've evolved the use of electric cars (eg. Elon Mollusk).

  • Farmer Dingus
    Farmer Dingus Hace 7 días

    Didn't realize I was watching scishow, hank.

  • CcruxX
    CcruxX Hace 7 días

    he said octopuses. TRIGGERED

  • LMGamer 36
    LMGamer 36 Hace 7 días +1

    The slug stole it. Now thats why snails are slow.

  • Weirdo
    Weirdo Hace 7 días

    Does this apply for Octopus aswell? Since they are considered a Molluscs

  • Aiden'sPlayland!
    Aiden'sPlayland! Hace 8 días

    with how intelligent octopus are, it wouldn't surprise me that they overcome humanity one day. considering the fact that they learn everything from birth since their mother dies before they are born. Heard there was a colony somewhere where the adults are now coming together in groups and teaching their young. How will that impact their misunderstood intelligence?

  • Michael Quintana
    Michael Quintana Hace 8 días


  • Joel Springman
    Joel Springman Hace 8 días

    Squids must be absent-minded.

  • TheImaxify
    TheImaxify Hace 8 días

    Nice music underneath!

  • Finlay Hamm
    Finlay Hamm Hace 9 días +1

    its's thE CAMBRIAN EXPlosion

  • Mauvie Hellco
    Mauvie Hellco Hace 9 días

    I've always wondered this. Thank you so much!

  • monhuntui
    monhuntui Hace 10 días

    Arms race? C'mon just stick to natural selection, an arms race is only applicable to war mongering humans really.

  • Rene' DeBlanc
    Rene' DeBlanc Hace 10 días

    But Mr Green but Mr Green! Wait.....wrong Green.

  • Om King
    Om King Hace 10 días

    Science is evolving.

  • Ovidiu-Florin BOGDAN
    Ovidiu-Florin BOGDAN Hace 10 días

    6:45 Non-Alien dinosaurs? Were there Alien Dinosaurs? Did I miss something?

  • Kalleballe240395
    Kalleballe240395 Hace 11 días

    Octopuses can edit their DNA like any other species in the world, but they are the only ones that can edit their RNA ;)

  • Madijo70
    Madijo70 Hace 12 días


  • xMagic666
    xMagic666 Hace 12 días

    Is... is that John green. I honestly can’t tell?

  • Lance Corporal Levi Ackerman

    Isnt he also in sci show? 😂

  • Nicholas Maude
    Nicholas Maude Hace 13 días

    I'd like to see something about Eurypterids aka Sea Scorpions.

  • Zz Zz
    Zz Zz Hace 13 días

    I thought this was going to be a story that explains why squids are the way they are

  • Sammy Sam
    Sammy Sam Hace 13 días


  • The Brotherhood Of steel
    The Brotherhood Of steel Hace 13 días +1

    6:16 octopi

  • Sophie Krueger
    Sophie Krueger Hace 14 días

    Funny, I had always assumed the rise of plant life on land (leading to a sudden spike of oxygen in the atmosphere and a subsequent cooling of the earth) was the reason that there were so few nautiloids and reason squid, octopus, and cuttlefish evolved? At least I read that somewhere else. Can anybody answer definitively if that is also part of what caused this leap in evolution or was it just due to the prey/predator arms/defence race?

  • Meenakshi Prabhakar
    Meenakshi Prabhakar Hace 14 días


  • Corbin Jose
    Corbin Jose Hace 15 días

    Im watching PBS on purpose... What happened to me?...

  • N. J. Powell
    N. J. Powell Hace 15 días

    why did they develop, or when, they developed the ink mechanism?

  • N. J. Powell
    N. J. Powell Hace 15 días

    make a video about Paleobotany

  • loafers
    loafers Hace 15 días +1


  • Birdbrain60
    Birdbrain60 Hace 15 días

    siphuncle sounds like if you put simon and garfunkle together

  • Keith Yostin
    Keith Yostin Hace 15 días

    Why is it that nothing comparable to megaladon has existed for thousands of years? It seems like a pretty big gap to fill and yet it hasn't been. How come there's nothing that hunts whales on a regular basis?

  • Saccillia
    Saccillia Hace 15 días

    So they made a reverse-weight belt to rise up? that is awesome! like making your own balloon without gas canisters!

  • Niall
    Niall Hace 15 días

    Funny how I never imagined the molusc --> cephalod transition. After this video it seems so obviou now

  • First Last
    First Last Hace 15 días

    PBS Eons? What is this?

  • Darp Cat
    Darp Cat Hace 16 días

    Onward my brethren!

  • Darp Cat
    Darp Cat Hace 16 días

    This makes me want to buy Cthulhu flavored ice cream

  • True_ Matt
    True_ Matt Hace 16 días

    How did chameleons learn to change color?

  • Alex Goodwin
    Alex Goodwin Hace 16 días +1

    New favorite channel. Great stuff

  • Playing Everything
    Playing Everything Hace 17 días

    Any video with one of the Green brothers is a video I'll watch.

  • Tamaki742
    Tamaki742 Hace 17 días

    WAIT. HELLO, HANK. Didn't expect to see you here.

  • Jose Luis Fernandez Coello

    how do nautilus survive the bone crushing depth?

  • Nuno Carrasquinho
    Nuno Carrasquinho Hace 18 días

    very interesting stuff, the only issue is the way it's told... It's like the Squid had a choice... "chould i grow the shell inside? what would be better?" thats now how evolution works... and he knows that.. I gess it's just to make the story telling more appeling, but i don't think it's worth it.

  • Runar Hellström
    Runar Hellström Hace 18 días

    THANK YOU for saying ''killed the non-avian Dinosaurs'' instead of saying like most ignorant science channels ''killed the dinosaurs''.
    There's a huge difference and I appreciate that some channels take science seriously.

  • daniel shadegg
    daniel shadegg Hace 18 días

    How bout Enantiornithines??

  • He_Who_ Ceases
    He_Who_ Ceases Hace 18 días +1

    Fish- "You see those cephalopods? They have lame shells, they will never do anything interesting with those."
    Cephalopods- "Hold my beer..."

  • Cain A
    Cain A Hace 18 días

    Good? That's an understatement. This channel is great! Seriously, great content and GREAT presentation.. Just subscribed!!

  • The Thunderant
    The Thunderant Hace 19 días +1

    Imagine being the first cephalopod to float.
    Just minding your own business, pumping your blood. suddenly you start to feel light headed, and the next thing you know, you’re floating away into the sky.

  • Andy M
    Andy M Hace 19 días +2

    I am here because of Splatoon

  • Rakel Glytta Brandt
    Rakel Glytta Brandt Hace 19 días +2

    Squids are the cutest

  • Myself Stoychev
    Myself Stoychev Hace 19 días +2


  • Instant Win
    Instant Win Hace 19 días

    Why didn’t the shells offer protection any longer?

    • Cain A
      Cain A Hace 18 días +1

      Instant Win
      I believe it was because of several factors but at one pivotal point when "they" start to evolve away from the floating shells and the floating shells, they began to curl their shells, or break them off at the end so they won't be so big and easier to maneuver. They accomplished this by coating the end of their shells, with their bodies to soften them.. I believe that's where they started to loose their shells.. I may be wrong but that's what I concluded from watching the video.
      Anywho. Excellent question. I won't believe the answer can be summed up in a single sentence. Again, I could be wrong. Instep believe every question deserves a satisfactory response so.. I hope this helped! 😂

  • eXceeDLoveR
    eXceeDLoveR Hace 19 días


  • sporegnosis
    sporegnosis Hace 19 días

    Zoidberg approves this video

  • TheCommonGentry
    TheCommonGentry Hace 19 días

    i'm all for evolutionary adaption; but it just makes me chuckle when credit is given to the the animal.. how they intentionally directed their own change and not just being a passive passenger within their own evolution... What i would like to see is the *science behind evolutionary adaption*. Where's the anatomical physiology mutation for those type of changes to happen. Yes, many many many years have gone by how can animal and plants "do" the changes to their bodies?

  • Zuroslav
    Zuroslav Hace 19 días

    Open up some random youtube recommendation and surprisingly Hank's there.

  • burnupover
    burnupover Hace 19 días

    I scroll down to see if anyone's gonna mention his pronounciation of 'develop' lol xD I like the video tho very informative...but i find it very funny the way he said develop lol anyone??
    Edit: well as I progress the video, I realized it wasnt just the word 'develop' , it was the letter L :P

  • Dr John Zoidberg
    Dr John Zoidberg Hace 19 días +2

    0:27 Excuse me, but where am I on that list?

  • Selwyn Renard
    Selwyn Renard Hace 20 días

    Informative, though you make evolution sound too purposeful. It wouldn't hurt to emphasize that random mutations ended up giving the edge.

  • ActsApologist
    ActsApologist Hace 20 días

    The narrator kept describing the evolutionary process as if it was something the animals were doing. I realize it's easier to describe that way.